The article is an attempt to organise and verify our knowledge about the action of the Home Army Resistance (HAR) at the Poviat Office of Public Safety (POPS) in Pabianice. Past publications dealing with this issue are based largely on eyewitness accounts and thus include discrepancies as to the details, not only concerning the course of the action but also of its preparation. Both the formation and activity of HAR were imposed by the need to respond to the changing geopolitical situation in the Polish lands from the beginning of 1945. When it became clear that liberation was tantamount to a new occupation, members of the Home Army, on the basis of the disbanded organisation, began forming new underground divisions to create what became known as the  „second conspiracy”. Activities taken by HAR and similar organisations were aimed at weakening and disorganising the newly installed power. The action of HAR members at the POPS in Pabianice formed part of this trend, and was one of the two most significant attacks conducted by members of the „new” underground after the war in the Łódź region. Although carefully planned and prepared, its success was thanks to the organisational weakness of the Communist security authorities. Its importance is even greater in that there was no use of weapons and no bloodshed. Memories of this event are rooted in the local community. Unfortunately, beyond the community and a narrow circle of historians, few people have heard about the action at the POPS in Pabianice.